Gipiemme track crank, which BB?
Tom Paterson
somewhat rare, expensive, and maybe not so hot stock part? The only info I've
found so far is "109" given as an identifier. Would prefer to use a Campy unit
if possible. TIA, Tom Paterson
John Dacey
wrote:
If you can find one, I wouldn't shy from using GPM's own unit.
As you note, some vintage Campagnolo models with 109mm spindles and
symmetrical overhangs should be functional equivalents. These include
Record track (model 1046 series), Victory (for double chainring) and
early C-Record Pista (model 303/102, before they changed to 111mm
spindles). Unfortunately, any of these may prove to be as costly
and/or elusive as the OEM crankbearing.
-------------------------------
http://www.businesscycles.com
John Dacey
Business Cycles, Miami, Florida
305-273-4440
Now in our twentieth year.
Our catalog of track equipment: seventh year online
-------------------------------
Qui si parla Campagnolo
found so far is "109" given as an identifier. Would prefer to use a Campy unit
if possible.
For inexpensive, a 111mm AC-H, for expensive, a NOS cup and cone Record(Pista)
BB-also 111mm-
Peter Chisholm
Vecchio's Bicicletteria
1833 Pearl St.
Boulder, CO, 80302
(303)440-3535
http://www.vecchios.com
"Ruote convenzionali costruite eccezionalmente bene"
John Dacey
Campagnolo) wrote:
>dustoyevsky-<< The only info I've
>found so far is "109" given as an identifier. Would prefer to use a Campy unit
>if possible.
>
>For inexpensive, a 111mm AC-H, for expensive, a NOS cup and cone Record(Pista)
>BB-also 111mm-
You might reexamine your readiness to suborn compromising the
chainline on track and fixed-gear bikes. No less a luminary than
Sheldon "By The Numbers" Brown has written on this very group that,
regarding the subject of fixed-gear chainline, that " I generally
consider anything more than 1 mm to be 'off' and anything more than 2
mm to be seriously 'off'". Paired with a GPM track crank, the
chainline error with either of the two bottom brackets you suggest
will be not less than 1 mm when used with most commonly configured
track hubs.
Qui si parla Campagnolo
chainline on track and fixed-gear bikes .
Did Campagnolo change their track crank when they went from the pista 109mm BB
to the 111mm BB, that was previously used for C-Record road cranks?
For a used Gipiemme track crank, a Campagnolo 111mm symetrical BB(AC-H or
Pista) will not adversely affect chainline, IMO and it'll work jus fine and
dandy.
<< Paired with a GPM track crank, the
chainline error with either of the two bottom brackets you suggest
will be not less than 1 mm when used with most commonly configured
track hubs.
Will it be more than 1mm?
Qui si parla Campagnolo
somewhat rare, expensive, and maybe not so hot stock part?
After looking thru my 'stuff', I do have a 109mm Campagnolo cup and cone
BB-Italian threads-interested??
Tom Paterson
>After looking thru my 'stuff', I do have a 109mm Campagnolo cup and cone
>BB-Italian threads-interested??
Response via email, tnx as usual/often Vecchio. --TP
Phil Holman
"Tom Paterson" <dusto...@aol.comnospam> wrote in message
news:20030409105240...@mb-cl.aol.com...
Take note of the caution about chain line. 2 mm off with the chain ring
inside of the rear cog will court disaster if you are planning to race
on the track or use it for jumps and sprints. Misalignment of the chain
ring by 1mm or so to the outside of the cog is tolerable and in my
opinion even desirable. BB flex is normally not symmetrical due to the
effect of chain tension with more flex to the left when cranking hard
with the right crankarm. The resulting deflection at the bottom of the
chain ring can cause your chain to run off the rear cog.
Phil Holman
Tom Paterson
>Take note of the caution about chain line.
Yes, I have seen two unshippings in not all that many hours at Alkek. Trying to
get this right, contributions/explanations much appreciated. --Tom Paterson
Baird Webel
> dustoyevsky-<< The only info I've
> found so far is "109" given as an identifier. Would prefer to use a Campy unit
> if possible.
I believe I have a Gipiemme track bottom bracket...drop me a line if you
still need one.
Baird
--
Baird Webel
Washington DC